diff --git a/addons/web/controllers/main.py b/addons/web/controllers/main.py
index 97f1f1a1735..30cca5b9566 100644
--- a/addons/web/controllers/main.py
+++ b/addons/web/controllers/main.py
@@ -1959,6 +1959,8 @@ class ExcelExport(ExportFormat, http.Controller):
         with ExportXlsxWriter(fields, len(rows)) as xlsx_writer:
             for row_index, row in enumerate(rows):
                 for cell_index, cell_value in enumerate(row):
+                    if isinstance(cell_value, (list, tuple)):
+                        cell_value = pycompat.to_text(cell_value)
                     xlsx_writer.write_cell(row_index + 1, cell_index, cell_value)
 
         return xlsx_writer.value